Resists Explained

When a spell is cast upon you, you have two chances to resist the spell. The first chance is a direct level comparison. If the caster is significantly lower than you are, there is a higher chance that the spell will be completely resisted. If they are significantly higher than you are, then the chance for this complete resistance is very low.

The second chance is when resistance scores come into play. Your resistance score is compared against the caster's level. The higher your resistance in relation to the attacker's level, the better your chance to resist the spell, up to a maximum chance of 75%.

Against most spells, this is a second check to completely resist the effects; however, for direct damage spells, this second resistance is the percentage of damage you will avoid on average.

When hit by a direct damage spell, there is a chance you will resist 100%, 75%, 50%, 25%, or 0% of the spell's damage. This is dependent upon your resistance score in that particular magic when compared to the attacking caster's level. The higher your score and the lower the caster's level, the better your chance to resist more damage. For example, if you had a fire resist of 150 vs. a level 50 mage's fire spell, you would resist roughly 50% of the damage on average.

I don't have the precise formula for you at this time, but I hope that clears some things up.